Are you speaking of Quadrature Amplitude Modulation? If so it is being used in many systems I have been involved with. Most MSO's are using 64QAM or 256QAM to transmit digital services. HSD, Telephony, and digital video services are all being transmitted over a QAM modulation schemes. Mainly on the downstream only though. Not real robust when it comes to getting through the noisy environment of the upstream frequency range. Hope this helps!
>I am looking to see if any technicians have done any QAM systems. If i am not mistaken we are the only technicians that have . if you know anyone or have your self drop me an email. (-REDACTED-)
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